<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <script type="text/javascript" src="../js/17/react.development.js"></script>
    <script type="text/javascript" src="../js/17/react-dom.development.js"></script>
    <script type="text/javascript" src="../js/17/babel.min.js"></script>
    <script type="text/babel">
    class Test extends React.Component {

        state = {
            date: new Date(),
        }
        // 组件挂载完成
        componentDidMount() {
            this.timer = setInterval(() => {
                this.setState({
                    date: new Date(),
                }) 
            }, 1000);
        }

        // 组件卸载前
        componentWillUnmount() {
            clearInterval(this.timer);
        }

        
        render() {
            return (
                <div>
                    <input type="text" />
                    当前时间：
                </div>
            )
        }
    }
    
    // 渲染dom
    ReactDOM.render(<Test age={33}/>, document.getElementById('app'))
    </script>

</body>
</html>